ST62E25C ST Microelectronics, ST62E25C Datasheet - Page 8

• Manufacturer Part Number: ST62E25C
• Description: (ST62T15C / ST62T25C) 8-BIT OTP/EPROM MCUs WITH A/D CONVERTER
• Manufacturer: ST Microelectronics

ST62T15C/T25C/E25C
MEMORY MAP (Cont’d)
1.3.3 Data Space
Data Space accommodates all the data necessary
for processing the user program. This space com-
prises the RAM resource, the processor core and
peripheral registers, as well as read-only data
such as constants and look-up tables in OTP/
EPROM.
1.3.3.1 Data ROM
All read-only data is physically stored in program
memory, which also accommodates the Program
Space. The program memory consequently con-
tains the program code to be executed, as well as
the constants and look-up tables required by the
application.
The Data Space locations in which the different
constants and look-up tables are addressed by the
processor core may be thought of as a 64-byte
window through which it is possible to access the
read-only data stored in OTP/EPROM.
1.3.3.2 Data RAM
In ST6225 devices, the data space includes 60
bytes of RAM, the accumulator (A), the indirect
registers (X), (Y), the short direct registers (V),
(W), the I/O port registers, the peripheral data and
control registers, the interrupt option register and
the Data ROM Window register (DRW register).
1.3.4 Stack Space
Stack space consists of six 12-bit registers which
are used to stack subroutine and interrupt return
addresses, as well as the current program counter
contents.
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Table 1. ST6225 Data Memory Space
* WRITE ONLY REGISTER
TIMER STATUS CONTROL REGISTER
DATA ROM WINDOW REGISTER
INTERRUPT OPTION REGISTE R
PORT A DIRECTION REGISTER
PORT B DIRECTION REGISTER
PORT C DIRECTI ON REGISTER
TIMER PRESCALER REGISTER
TIMER COUNTE R REGISTE R
PORT A OPTION REGISTER
PORT B OPTION REGISTER
PORT C OPTION REGISTE R
DATA ROM WINDOW AREA
A/D CONTROL REGISTER
PORT A DATA REGISTE R
PORT B DATA REGISTE R
PORT C DATA REGISTER
WATCHDOG REGISTER
DATA RAM 60 BYTES
A/D DATA REGISTER
ACCUMULATOR
W REGISTER
X REGISTER
Y REGISTER
V REGISTER
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
64 BYTES
0C8h*
0C9h*
0CCh
0CDh
0BFh
0C0h
0C1h
0C2h
0C3h
0C4h
0C5h
0C6h
0C7h
0CAh
0CBh
0CEh
0CFh
0D0h
0D1h
0D2h
0D3h
0D4h
0D5h
0D6h
0D7h
0D8h
0D9h
0FEh
0FFh
000h
03Fh
040h
07Fh
080h
081h
082h
083h
084h